I love love love these boots! I'm on my second pair. I use them in the winter for "walking" the dogs - which is really 45-60 partially paved, mostly woods. Thing is I never take them off, so I've worn my first pair out. Actually they seem fine but estimating it's time based on mileage. My feet are always happy warm and dry. I'm so happy to find out that there's a ventilator version, I'll be buying them in a month or so. I have a pair of the Moab ventilator and don't love them as much (ball of the foot pain) but now I know the Siren exists for summer - woohoo! BTW I also love my Merrell casual shoes that I use for travel, I've walked all over many cobbled European streets with no foot fatigue. Thanks.